Welcome to the forum Okie!
Two-whistle mechanics (in WI):
We just received a new directive from our state association (WIAA). The granting official reports the details to the table and then locates him/herself on the tableside of the intersection of the division line and the center restraining circle for a 30 second TO and the backside of the intersection of the division line and the center restraining circle for a 60 second TO.
The non-granting official positions him/herself at the spot of the throw-in.